Updated at 1:01 p.m. Tuesday: Thaddeus Williams, who was found shot in a McKinney backyard on Monday afternoon, died of his wounds later in the day, around 11 p.m., said Officer Sabrina Boston, spokeswoman for the McKinney Police Department. Detectives are now investigating as a homicide.

The resident of a home on the 700 block of Dudperkins Street called 911 on Monday afternoon when she heard gun shots.

"At this time, we have limited information as to a motive or suspects," Boston said in a press release. "Detectives are continuing to interview witnesses."

Police are seeking the public's help. Anyone with information on the shooting can call Detective Paul Hardin at 972-547-2742 or Detective Baxter at 972-547-2736.

Updated at 9:29 p.m. Monday: Police have identified the shooting victim as Thaddeus Williams, 30. He remains in critical condition. [Spelling of the name corrected by police Tuesday.]

Original post: Police are investigating a shooting that took place at about 3:07 p.m. Monday at the 700 block of Dudperkins Street.

First responders found a man with gunshot wounds in the backyard, police said. The man was flown to Medical Center of Plano in critical condition. Police have not released the man's name or age.

Detectives are working the scene. People who have information about this incident can contact the McKinney Police Department at 972-547-2700.